1. David, Kumar and Irfan go to the gym on 2nd June and rest on the next day. After the rest day, David goes to the gym every 2 days, Kumar goes there every 3 days and Irfan goes there every 4 days. When will they next meet in the gym again?

2. Jane has more stamps than Danny. If Jane gave Danny 1/3 of her stamps, Danny will have 200 more stamps than Jane. If Jane gave Danny 1/4 of her stamps, Danny will have 100 more stamps than Jane. How many stamps does Jane have?

3. There were some ten-cent coins and fifty-cent coins in a piggy bank. The number of ten-cent coins in the piggy bank was 1/2 of the number of fifty-cent coins. Ahmad took out 5 fifty-cent coins and exchanged them for ten-cent coins. Then he put the money back into the piggy bank. The number of fifty-cent coins became 5/8 of the number of ten-cent coins. How much money was there in the piggy bank?